Remove stale git-LFS compiler pointer files from bin/compiler

[clholgat]

What

Removes two orphaned git-LFS pointer files:

• bin/compiler/macos/valdi_compiler
• bin/compiler/linux/valdi_compiler

Why

These are stale git-LFS pointer files left over from before the LFS→GCS-archive migration. They are 133-byte stubs referencing large LFS objects (~49 MB / ~64 MB), and:

• The public repo no longer has an LFS filter for bin/** in .gitattributes, so these are orphaned pointers.
• The public build compiles the compiler from source (use_local_compiler=True in the export transform), so these binaries are not used.
• Copybara cannot remove them: bin/compiler/** is in REPO_EXCLUDES, which feeds the workflow's destination_files, so copybara treats those paths as out-of-scope and never deletes them.

Note

This removes the pointer files from main. The underlying LFS objects remain in LFS storage/history until separately garbage-collected (needs a history operation / GitHub support) — out of scope for this PR.

[github-actions]

Sensitive Files Detected

📎 Prebuilt binary — Changes a prebuilt binary — requires verification of provenance.

_{This is an automated notice. A maintainer will review after import.}

[github-actions]

📊 PR Size: size/XS

Total changes: 6 lines (2 files)

Top files changed:

• bin/compiler/linux/valdi_compiler: +0 -3
• bin/compiler/macos/valdi_compiler: +0 -3

_{Size calculated as additions + deletions. Labels: XS (<10), S (<50), M (<250), L (<1000), XL (1000+)}